Operation of gas protection and tap changer

1, gas protection device operation, normal operation, heavy gas protection pressure plate throw trip position, light gas protection throw signal position. Under special circumstances, the pressure plate of heavy gas protection should be changed to signal position. The most common situation in the work is that the transformer after overhaul oil or filter oil, re-put into operation for a period of time, generally 2-3 days, until the gas or no gas bubble, then put the heavy gas protection to trip position. Operation and maintenance of tap-changer. No load voltage regulation: when changing the position of the TAP joint, turn several times in the positive and negative directions to eliminate the oxidation film and oil on the contact, pay attention to the correct position. After changing the tap position, measure whether the DC resistance is qualified or not. 2. ON-LOAD VOLTAGE REGULATION: oil samples are taken every three months for testing; electric operating mechanism is checked and kept in good condition; after 5000 changes, it is checked out. If you change the tap in the case of shutdown, the same to measure the DC resistance is eligible

　　The gas in the oil pillow is breathed by the absorber through it, clearing the impurity, preventing the oil in the oil pillow from contacting with the atmosphere directly, and bringing the moisture into the transformer. The Silica Gel in the Haustoria becomes pink when it is wet, it needs to be replaced or the Silica Gel is dried. Oil Purifier: it is equivalent to oil filter to eliminate water and impurity in oil. (less used) operation of transformer oil. The role of oil in transformers: Insulation and cooling. The function of oil in circuit breaker: INSULATION AND ARC extinguishing. When the transformer is loaded, the temperature of the oil will increase gradually. The increase of the temperature of the oil will accelerate the oxidation of the oil. 3. In general, 60-70 °C, the aging process of oil is very slow, and normal operation of transformer oil temperature is basically in this range. When the temperature reaches 120 °c, the oxidation of the oil begins to intensify. Take oil samples for testing periodically or as needed